A method for a source-controlled channel-decoding of data in a frame format includes the steps of channel-decoding a given frame of data, determining an a-posteriori information based on a reliability decision of the channel-decoding and/or a source-decoding subsequent to the channel-decoding, calculating an a-priori information based on the a-posteriori information and based on a residual redundancy of the data, and channel-decoding the given frame once more using the a-priori information. The method thus uses the residual correlation between bits in a frame. The method preferably uses the intra-frame correlation in a GSM system. A channel-decoder configuration is also provided.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method for a source-controlled channel-decoding of data in a frame format, the method which comprises: channel-decoding a given frame of data; determining an a-posteriori information based on at least one of a reliability decision of the channel-decoding and a source-decoding subsequent to the channel-decoding; calculating an a-priori information based on the a-posteriori information and based on a residual redundancy of the data; and channel-decoding the given frame once more using the a-priori information.
2. The method according to claim 1, which comprises providing, during an encoding of the data of the given frame, respective data of the given frame with different error protections depending on a significance of the respective data for a successful transmission.
3. The method according to claim 1, which comprises determining the a-priori information from a logic linking of the a-posteriori information with source properties.
4. The method according to claim 3, which comprises determining the source properties by taking into account a given number of preceding frames.
5. The method according to claim 4, which comprises selecting the given number based on at least one source property selected from a group consisting of a correlation and a sationarity.
6. A method for a source-controlled channel-decoding of data in a GSM frame format, the method which comprises: channel-decoding a given frame of data of a voice channel according to the GSM standard; determining an a-posteriori information based on at least one of a reliability decision of the channel-decoding and a source-decoding subsequent to the channel-decoding; calculating an a-priori information based on the a-posteriori information and based on a residual redundancy of the data; and channel-decoding the given frame once more using the a-priori information.
7. The method according to claim 6, which comprises providing, during an encoding of the data of the given frame, respective data of the given frame with different error protections depending on a significance of the respective data for a successful transmission.
8. The method according to claim 6, which comprises determining the a-priori information from a logic linking of the a-posteriori information with source properties.
9. The method according to claim 8, which comprises determining the source properties by taking into account a given number of preceding frames.
10. The method according to claim 8, which comprises determining the source properties by taking into account the last 128 frames.
11. The method according to claim 8, which comprises determining the source properties by taking into account the last 256 frames.
12. The method according to claim 9, which comprises selecting the given number based on at least one source property selected from a group consisting of a correlation and a sationarity.
13. A channel-decoder configuration, comprising: a channel-decoder decoding a given frame having data, said channel-decoder determining an a-posteriori information relating to the data of the given frame by using a reliability decision; and a calculation unit connected to said channel-decoder, said calculation unit determining an a-priori information based on the a-posteriori information and supplying the a-priori information to said channel-decoder, said channel-decoder decoding the given frame once more using the a-priori information.
14. The channel-decoder configuration according to claim 13, including a source-decoder connected to said channel-decoder, said channel-decoder supplying information for determining the a-posteriori information to said source-decoder, said calculation unit receiving the a-posteriori information from at least one of said channel-decoder and said source-decoder.
15. The channel-decoder configuration according to claim 13, wherein said calculation unit determines the a-priori information from a logic linking of the a-posteriori information with source properties.
16. The channel-decoder configuration according to claim 15, wherein said calculation unit determines the source properties by taking into account a given number of preceding frames.
17. The channel-decoder configuration according to claim 13, including an encoder connected to said channel-decoder, said encoder providing respective data of the given frame with different error protections depending on a significance of the respective data for a successful transmission.
18. A channel-decoder configuration, comprising: a channel-decoder decoding a given frame having data; a source-decoder connected to said channel-decoder, said source-decoder receiving information from said channel-decoder for determining an a-posteriori information; and a calculation unit connected to said source-decoder, said calculation unit determining an a-priori information based on the a-posteriori information and supplying the a-priori information to said channel-decoder, said channel-decoder decoding the given frame once more using the a-priori information.
19. The channel-decoder configuration according to claim 18, wherein said calculation unit determines the a-priori information from a logic linking of the a-posteriori information with source properties.
20. The channel-decoder configuration according to claim 19, wherein said calculation unit determines the source properties by taking into account a given number of preceding frames.
21. The channel-decoder configuration according to claim 18, including an encoder connected to said channel-decoder, said encoder providing respective data of the given frame with different error protections depending on a significance of the respective data for a successful transmission.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
December 13, 1999
September 18, 2001
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